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Acid Test

I'm a rookie service tech and while we're getting near the end of the cooling season, I'm curious to know from you smart guys when should an acid test be done? Should it be done if non condensables are in the system? Should it be done if the compressor has opened its internal overload? I've also read that acidic oil has tends to have a sweeter smell to it? Is there a way to identify acidic oil without doing initially doing an acid test (for example as you take your high side gauge off examine/smell the oil that comes out?) thanks

If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!

Im not a pro, but I've never used an acid test. Generally, you are concerned with acid when you have a compressor burnout. In that situation, you would cut the compressor out, use an acid neutralizer and/or flush, then purge with nitrogen. Here's some helpful links (yahoo or google can help you find answers too)